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System and method of transmit beam selection

a beam selection and transmit beam technology, applied in the field of wireless communication techniques, can solve the problems of requiring a lot of feedback information and traditional beamforming strategies may not efficiently satisfy the per-antenna transmit power constraint, and achieve the effect of facilitating beam selection

Active Publication Date: 2011-09-13
MARVELL ASIA PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]Embodiments of the present invention overcome the above-mentioned and various other shortcomings of conventional technology, providing a system and method of beamforming that facilitate beam selection without requiring an exhaustive search. In some implementations, a beamforming technique may select candidate vectors to construct a beamforming matrix without having to compute each matrix element.

Problems solved by technology

However, this method requires a lot of feedback information (i.e., signal information transmitted from the receive device back to the beamforming transmit device).
Conventional SVD beamforming also introduces transmit power fluctuations among antennae; thus, traditional beamforming strategies may not efficiently satisfy a per-antenna transmit power constraint.

Method used

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Embodiment Construction

Introduction

[0014]The beamforming techniques described below may be utilized for flat fading channels as well as for frequency selective fading channels with orthogonal frequency division multiplexing (OFDM). For simplicity, the beamforming techniques are explained in the context of single carrier systems for flat fading channels; those of skill in the art will appreciate that the disclosed methodologies may readily be extended to be implemented in OFDM systems.

[0015]In some implementations, the receive signal may be modeled as

y=Hx+z  (Equation 1)

y=[y1 . . . yNR]T  (Equation 2)

where

[0016]H=[h1,1…h1,NT⋮⋱⋮hNR,1…hNR,NT](Equation⁢⁢3)

x=[x1 . . . xNT]T  (Equation 4)

z=[z1 . . . zNR]T  (Equation 5)

[0017]In this model, xt is a transmit signal from a transmit antenna, t, zr is the noise in a receive antenna, r, H is the instantaneous channel matrix where hr,t is a channel gain from transmitter, t, to receiver, r, and NR and NT are the number of receive and transmit antennae, respectively. Add...

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Abstract

A system and method of beamforming facilitate beam selection without requiring an exhaustive search. In some implementations, a beamforming technique may select candidate vectors to construct a beamforming matrix without having to compute each matrix element.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims the benefit of U.S. provisional application Ser. No. 60 / 914,479, filed Apr. 27, 2007, entitled “Transmit Beam and Antenna Selection for MIMO Systems,” the disclosure of which is incorporated herein by reference in its entirety.[0002]The present application is also related to co-owned U.S. patent application Ser. No. 12 / 044,117, filed Mar. 7, 2008, entitled “Codebook Selection Algorithm for Transmit Beamforming,” and U.S. patent application Ser. No. 12 / 062,462, filed Apr. 3, 2008, entitled “System and Method of Beamforming with Reduced Feedback,” the disclosures of which are incorporated herein by reference in their entireties.BACKGROUND[0003]1. Field of the Invention[0004]Aspects of the present invention relate generally to wireless communication techniques, and more particularly to a system and method of beamforming that select candidate vectors to construct a beamforming matrix.[0005]2. Description of Rela...

Claims

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Application Information

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IPC IPC(8): H04L27/00
CPCH04B7/0695H04L25/0204H04L25/0246H04L25/03006H04L2025/03426
Inventor LEE, JUNGWONZHANG, HONGYUANNABAR, ROHIT U.
Owner MARVELL ASIA PTE LTD